New beautiful results on marine particle speciation, a challenge for the GEOTRACES community…

Advanced Light Source x-ray spectromicroscopy (XANES) allows a fine description of the marine Fe pool chemical speciation and mineralogy. This work describes diverse arrays of iron particles (20- 700 nm), showing impressive variations in the oxidation state and composition of these iron particles between the coasts of South Africa and Antarctica. Moreover, different iron pools are occurring in different frontal zones. Because particle speciation is directly linked to the element solubilities, these differences may affect the production of bioavailable dissolved iron.

Iron_particle_speciation

Source : Science (click on the image to view it larger)

Reference:

B. P. von der Heyden, A. N. Roychoudhury, T. N. Mtshali1, T. Tyliszczak, S. C. B. Myneni. (2012). Chemically and Geographically Distinct Solid-Phase Iron Pools in the Southern Ocean: Science 338 (6111): 1199-1201, DOI: 10.1126/science.1227504

Latest highlights

Science Highlights

New trace metal data in the Seas of Japan and Okhotsk

Nakaguchi and colleagues realized full-depth and section distributions of traces metals collected from the Seas of Japan and Okhotsk.

24.05.2022

Science Highlights

The Arctic Ocean is a net source of micronutrients toward the North Atlantic through the gateway of Fram Strait

Krisch and colleagues present a flux budget for micronutrient exchange between the Arctic and the North Atlantic Ocean.

18.05.2022

Science Highlights

Confrontation of two models to constrain the hydrothermal iron contribution to the Southern Ocean export production

Tagliabue and his co-workers compare the hydrothermal dissolved iron simulated by both models.

11.05.2022

Science Highlights

A better insight into parameters that control particle flux in the ocean

Xiang and coworkers compiled full ocean-depth size-fractionated particle data from 3 recent U.S. GEOTRACES cruises.

10.05.2022

Rechercher